Manley 11688-1 Severe Duty Pro Flo Intake Valve for LS7 2.205" Head Diameter

The Manley 11688-1 is a premium Severe Duty Pro Flo intake valve engineered specifically for Chevrolet LS7 applications. This high-performance valve features a 2.205-inch head diameter and 5.200-inch overall length, designed to deliver exceptional durability and performance in demanding racing and high-performance street engines.

Premium NK-844 Stainless Steel Construction:

Manufactured from Manley's exclusive NK-844 stainless steel material, this intake valve offers superior strength and heat resistance that outperforms competing materials. The NK-844 alloy displays over four times the ultimate tensile strength of competitors' best intake valve materials at 1000°F, making it ideal for high-temperature gasoline engines.

Key Specifications:

• Head diameter: 2.205 inches
• Stem diameter: 8mm (0.3133 inches)
• Overall length: 5.200 inches (stock length)
• Valve tip length: 0.300 inches
• Underhead angle: 12° x 3/8" Pro Flo design
• Valve head style: 7° dish
• Margin: 0.050 inches
• Seat width: 0.100 inches

Performance Features:

• Chrome-plated valve stem with 0.0002" thick hard chrome coating for superior wear resistance
• Hardened valve tip for extended durability
• Undercut Pro Flo stem design for improved airflow
• Fully machined and swirl-polished finish
• Proven fatigue life exceeding 100 million cycles at 40,000 psi and 1400°F

This valve is sold individually and represents Manley's commitment to manufacturing the highest quality performance valvetrain components. The Severe Duty series is trusted by professional engine builders and racers worldwide for its unmatched reliability in extreme applications.